lockin: 2nd order lowpass

dsp/src/lockin.rs

@@ -1,9 +1,9 @@
 use super::{lowpass::Lowpass, Complex};
-use generic_array::typenum::U4;
+use generic_array::typenum::U2;
 
 #[derive(Clone, Default)]
 pub struct Lockin {
-    state: [Lowpass<U4>; 2],
+    state: [Lowpass<U2>; 2],
 }
 
 impl Lockin {

src/bin/lockin-external.rs

@@ -126,7 +126,7 @@ const APP: () = {
         let conf = "frequency_discriminator";
         let output = match conf {
             // Convert from IQ to power and phase.
-            "power_phase" => [(output.log2() << 10) as _, output.arg()],
+            "power_phase" => [(output.log2() << 24) as _, output.arg()],
             "frequency_discriminator" => [pll_frequency as _, output.arg()],
             _ => [output.0 << 16, output.1 << 16],
         };